Non-spherical surface shape measuring device

Details Non-spherical surface shape measuring device Non-spherical surface shape measuring device

1998-01-07

2000-03-07

Fulton, Christopher W.

Geometrical instruments

Gauge

With support for gauged article

33 28, 33507, G01B 1124

Patent

active

060323779

ABSTRACT:
A non-spherical surface shape measuring device and method that measures the shapes of object surfaces that have rotationally symmetrical non-spherical surface shapes on the basis of relative deviation values from the shape of a reference surface, the non-spherical surface shape measuring device includes a measuring means for obtaining relative deviation values between a reference surface and an object surface by measuring corresponding sampling points on the surfaces of the reference surface and the object surface and storing predetermined coefficients of variables prior to measurement. A first operating means approximates the partial differential coefficients for the predetermined variables and models the relative displacement, between the object surface and the reference surface and the XY-coordinates of the sampling points, into functional equivalents of the partial differential coefficients. A second operating means approximates the relative displacement between the object surface and the reference surface and a third operating means corrects the relative deviation values according to the relative displacement approximated by the second operating means.

REFERENCES:
patent: 3400463 (1968-09-01), Barringer
patent: 4914827 (1990-04-01), Cook
patent: 5283630 (1994-02-01), Yoshizumi
patent: 5886775 (1999-03-01), Houser et al.

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